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Popular conspiracy theory website UFO Sightings Daily says of the finding: “NASA is constantly looking at mathematical measurements, stats, winds speed, surface pressure and hundreds of other stats instead of doing their job, which is discovering and reporting signs of intelligent life.”

The website, run by Scott C Waring, lists what it believes is in the picture: “One is a skull that is broken open at the forehead.

“It has an extended cranium, antenna, eyes, nose, mouth, chin and beard, which seems to depict a male warrior.

“I say warrior because his helmet has a ridge down its centre of the forehead area to the centre of the cranium as well as a ridge around the broken area.”

However, sceptics and NASA would say the skull and other similar findings are just the effects of pareidolia – a psychological phenomenon when the brain tricks the eyes into seeing familiar objects or shapes in patterns or textures such as a rock surface.

This would mean that the Martian warrior skull could just be a misshapen rock.

This is not the first time that ‘evidence’ of aliens on Mars has been discovered.

Earlier this year, an "alien face" was found in a NASA satellite image of Mars, according to more bonkers claims.

Mr Waring was convinced it could be a rock carving, done by a Martian race, in the same way ancient Britons carved out the chalk figures in hillsides like the giant of Cerene Abbas in Dorset and the Long Man of Wilmington in East Sussex.

The Martian faces (Image: UFO SIGHTINGS DAILY)

However, NASA insisted the rock is just a meteorite impact crater that has been left in the unusual form by later erosion.

When NASA released the image under the "alien head" caption, it said: "The image shows an impact crater in Chryse Planitia, not too far from the Viking 1 lander site, that to seems to resemble a bug-eyed head.

"The two odd depressions at the north end of the crater (the ‘eyes’) may have formed by wind or water erosion.

"This region has been modified by both processes, with water action occurring in the distant past via floods that poured across western Chryse Planitia from Maja Valles, and wind action common occurrence in more recent history.”